<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 进度条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tabs栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight"  type="number" ></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <!-- 商品分类 -->
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps"  @change="handleChange" expand-trigger="hover"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                     <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                         <!--  复选框组 -->
                         <el-checkbox-group v-model="item.attr_vals" >
                            <el-checkbox  border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                         </el-checkbox-group>
                     </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action表示图片上传地址 -->
                    <el-upload :action="uploadURL"  :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture"
                    :headers="headerObj" :on-success="handleSuccess">
                    <el-button size="medium" type="primary">点击上传</el-button>
                    <!-- <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div> -->
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑界面 -->
                    <quill-editor v-model="addForm.goods_introduce">
                    </quill-editor>
                    <!-- 添加商品按钮 -->
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览对话框 -->
        <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%" >
            <img :src="previewPath" alt="" class="preViewImg">
        </el-dialog>

    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return{
            activeIndex : '0',
            //添加商品的表单验证对象
            addForm: {
                goods_name: '',
                goods_price: 0 ,
                goods_weight: 0 ,
                goods_number: 0 ,
                goods_cat: [],
                pics: [],
                goods_introduce: '',
                attr: [],
            },
            addFormRules: {
                goods_name:[
                     { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price:[
                     { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_weight:[
                     { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_number:[
                     { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat:[
                     { required: true, message: '请输入商品分类 ', trigger: 'blur' },
                ],
            },
            //商品分类列表
            catelist:[],
            cateProps:{
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            //动态参数列表数组
            manyTableData: [],
            //静态属性列表数组
            onlyTableData: [],
            //图片上传地址
            uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
            //图片上传headers请求头对象
            headerObj:{
                Authorization :  window.sessionStorage.getItem('token')
            },
            previewPath: '',

            //图片预览对话框
            previewDialogVisible: false,

        }
    },

    created() {
        this.getCateList()
    },

    methods: {
        //获取所有商品分类数据
        async getCateList(){
          const { data:res } = await this.$http.get('categories')
          if(res.meta.status !== 200){
              return this.$message.error('获取商品分类数据失败!')
          }
          
          this.catelist = res.data
        },
        //级联选择器变化触发函数
        handleChange(){
            //判断级联选择是否为三级分类
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        //阻止未填tabs切换
        beforeTabLeave(activeName, oldActiveName){
            if(this.addForm.goods_cat.length !==3 ){
                this.$message.error('请先选择商品分类!')
                return false
            }
        },
        async tabClicked(){
            //证明访问的是动态参数列表
            if(this.activeIndex === '1'){
             const { data:res } = await  this.$http.get(`categories/${this.cateId}/attributes`, { params: {sel: 'many'}} )
             if(res.meta.status !== 200){
                 return this.$message.error('获取动态参数列表失败!')
             }
             res.data.forEach(item => { 
             item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
             })
             this.manyTableData = res.data
            }
            //证明访问的是静态属性列表
            if(this.activeIndex === '2'){
             const { data:res } = await  this.$http.get(`categories/${this.cateId}/attributes`, { params: {sel: 'only'}} )
             if(res.meta.status !== 200){
                 return this.$message.error('获取静态属性列表失败!')
             }
             //res.data.forEach(item => { 
             //item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
             //})
             this.onlyTableData = res.data
            }
        },

        // 处理图片预览效果
        handlePreview(file){
           this.previewPath = file.response.data.url
           this.previewDialogVisible = true
        },
        // 处理移除图片操作
        handleRemove(file){
             // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中找到图片的索引值
            const i = this.addForm.pics.findIndex(x =>{
                x.pic === filePath
            })
            // 3.调用数组的splice方法 将图片从pics数组中删除
            this.addForm.pics.splice(i, 1)
        },
        // 监听图片上传成功事件
        handleSuccess(response){
            // 1.拼接得到一个图片信息对象
            const picInfo = {
                pic : response.data.tmp_path
            }
            // 2.将图片信息push到pics数组中
            this.addForm.pics.push(picInfo)
        },
        //添加商品
        add(){
            //表单验证
            this.$refs.addFormRef.validate (async vaild => {
                if(!vaild) {
                    return this.$message.error('请填写必要的表单项!')
                }
                 // 执行添加业务逻辑
            //lodash cloneDeep(obj)
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id : item.attr_id,
                    attr_value: item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTableData.forEach(item => {
                const newInfo = {
                    attr_id : item.attr_id,
                    attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs

            // 发起请求添加商品
            const { data:res } = await this.$http.post('goods', form)
            if(res.meta.status !== 201){
                return this.$message.error('添加商品失败！')
            }
            this.$message.success('添加商品成功！')
            this.$router.push('/goods')
            // 商品的名称必须唯一
            })

        },
    },

    computed: {
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
 margin: 0 10px 0 0 !important;
}

.preViewImg {
    width: 100%;
}

.btnAdd {
    margin-top: 15px;
}
</style>